Anaximander

Anaximander (610 BC-546 BC) was a Presocratic Greek philosopher who lived in Miletus, Ionia. He belonged to the Milesian school, and he was a student of Thales of Miletus. Anaximander notably believed in never-ending change, and he also drew a map of the world.

Biography
Anaximander was born in Miletus, Ionia in 610 BC to a Greek family, and he learned the teachings of his master Thales of Miletus. Anaximander became the second master of the Milesian school, where he counted Anaxagoras and Pythagoras among his pupils. He was the first philosopher who was known to have written down his studies, and he tried to observe and explain different aspects of the universe, with a particular interest in its origins. He argued that the indefinite (apeiron) was the source of all things, saying that it was the fusion of all opposites. Anaximander would also become involved with politics in Miletus, being sent as a leader to one of its colonies. He died in around 546 BC.